II. Arbeiten von speciellerem Character. 1. Crinoidea. 199 



quently spiniferous, deeply inserted between the first radials, in which the upper 

 lateral margins are exceptionally long ; second series composed of two plates, 

 much smaller than the first; third series consisting of one or two plates, located 

 between the arm bases. Anal area not distinct. Construction of vault and arms 

 unknown. Column round, central canal round. 



Archaeocrimts nov. gen. (subfam. Rhodocrinidae}. Calyx large, pear-shaped, 

 sometimes obcouical ; plates smooth or granulated ; the radial plates with keel- 

 like elevations along their median line , but less prominently than in Glypto- 

 crinus , and the carinae narrower. Unterbasals five , pentagonal , rather small 

 and rarely extending beyond the column. Basals five, hexagonal , with a trun- 

 cate upper side , supporting the first radial plates. Primary radials 3X5, 

 of medium size , gradually decreasing upward , width and hight about equal. 

 They support two rows of secondary radials of three to four plates in each 

 row, which are followed in the same line by the arm plates, all further divi- 

 sions of the rays taking place in the arms. The rays are widely separated by 

 large interradial areae. Arms short, slender, the branches divergent; composed 

 of two rows of cuneiform pices, alternately arranged and interlocking. Interradial 

 areae large ; resting directly upon the upper truncate side of the basals, and pass- 

 ing gradually into vault pieces. The plates of the two proximal series are gene- 

 rally of equal size, all succeeding ones are much smaller. There are two plates in 

 the second series in all five areae, those at the posterior side are probably a little 

 wider. Interaxillaries represented by one or more plates. Vault and anus un- 

 known. Column round. 



Anthemocrinus nov. gen. (subfam. Rhodocrinidae, Syn. Eucrinm Angelin partim). 

 Calyx depressed , subglobose , composed of comparatively few plates , which in 

 both known specimens are convex and striated. Underbasals five, small basals 

 five, large, subequal, hexagonal, the upper side truncated for the support of an 

 interradial plate. Primary radials 2X5, both pentagonal, wider than high, of 

 nearly equal size and similar form ; the first and second meeting by straight mar- 

 gins. The second plate supports upon each sloping side a single secondary ra- 

 dial, which in turn supports a heavy arm, this soon divides, sometimes a second 

 time, and the branches after each division are half as large as the arm below. 

 All the arms and branches, from the base up, are composed of two rows of joints, 

 alternately arranged, very slightly interlocking. The first arm joints are enclosed 

 within the body walls by one or two interbrachial plates. The branching of the 

 arms and the whole arm structure is very similar to that of Periechocrinus. There 

 is properly only a single plate in each interradial area, and this, as stated, rests 

 upon the truncate upper side of the basals between both primary radials, and ex- 

 tends to the arm bases. It is the largest plate of the entire calyx, hexagonal, 

 higher than wide, and supports upon its upper side - - between the arms - - the 

 interbrachial plates above mentioned. The anal area differs in having above its 

 first plate a row of smaller plates , longitudinally arranged as in Glyptaster and 

 Eucrinus, and these support the anus. Vault and anal aperture unknown. Co- 

 lumn round. 



Von neuen Arten beschreiben Wachsmuth und Springer nur fiinf, welche 

 sammtlich zur Unterfamilie der Actinocrinidae gehoren : Batocrinus Lovei, B. Whi- 

 tei, Eretmocrinus originarius, E. intermedius, E. adultus. 



Als zweifelhafte Gattungen werden zur Familie der Sphaeroidocrinidae gerech- 

 net : 1. Comlylocrinus Eichwald, 2. Schizocrinus Hall, 3. Scyphocrinus Hall = 

 Cnpulocrinus D'Orbigny, 4. Hadrocrinus Lyon. 



Alle in vorstehender Ubersicht angefiihrten Gattungen der Sphaeroidocriuidae 

 werden ausfithrlich geschildert ; namentlich die unterscheidenden Merkmale wer- 



